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function [y] = chirp(t,f0,t1,f1,frm,phse)
//This function evaluates a chirp signal at time t.
//Calling Sequence
//y = chirp(t)
//y = chirp(t, f0)
//y = chirp(t, f0, t1)
//y = chirp(t, f0, t1, f1)
//y = chirp(t, f0, t1, f1, frm)
//y = chirp(t, f0, t1, f1, frm, phse)
//Parameters
//t: vector
//f0:
//t1:
//f1:
//frm: string value, takes in "linear", "quadratic", "logarithmic"
//phse:
//Description
//This is an Octave function.
//This function evaluates a chirp signal at time t. A chirp signal is a frequency swept cosine wave.
//The first argument is a vector of times to evaluate the chirp signal, second argument is the frequency at t=0, third argument is time t1 and fourth argument is frequency at t1.
//The fifth argument is the form which takes in values "linear", "quadratic" and "logarithmic", the sixth argument gives the phase shift at t=0.
//Examples
//chirp([4,3,2,1],4,5,0.9)
//ans =
// column 1 to 3
// 0.9685832 0.2486899 0.0627905
// column 4
// - 0.3681246
funcprot(0);
rhs = argn(2)
if(rhs<1 | rhs>6)
error("Wrong number of input arguments.")
end
select(rhs)
case 1 then
y = callOctave("chirp",t)
case 2 then
y = callOctave("chirp",t,f0)
case 3 then
y = callOctave("chirp",t,f0,t1)
case 4 then
y = callOctave("chirp",t,f0,t1,f1)
case 5 then
//if(~(form == "linear" | form == "quadratic" | form == "logarithmic"))
//error("Chirp does not understand that form. Enter linear, quadratic or logarithmic.")
//else
y = callOctave("chirp",t,f0,t1,f1,frm)
//end
case 6 then
y = callOctave("chirp",t,f0,t1,f1,frm,phse)
end
endfunction
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